000 00311nam a2200121Ia 4500
008 160509s9999 xx 000 0 und d
020 _a0028-0836
100 _aNature
245 _aNature : 1971 : Volume 232(Jul-Aug) : Shelf 15.1
260 _bNature Publishing Group
_c1971
300 _a664p.
650 _aNature
999 _c2279
_d2279